Rallies in Charlottesville over the weekend brought together many factions of the white supremacist movement, and put a younger generation of white supremacists in the spotlight . Reporter A.C. Thompson has been tracking hate groups for ProPublica’s “ Documenting Hate ” project. He joined us to talk about his reporting, and what he saw in Virginia. We also talked with University of Maryland psychology professor Arie Kruglanski , who studies the mental processes behind radicalization, de